Self-oiling burnishing tool



945. w. E. MacGUIRE ETAL 2,387,453

SELF-OILING surmxsnme TOOL Filed May- 18, 1944 I NV EN TOR3 William tiMac 6am:

Patented Oct. 23, 1945 2,387,453 c sE F-iomno. nonmsnmo 'rooL William E. MacGuireand Kenneth J. Dodge,

Louisville, Ky., .assignorsfiby mesne assignments, to Frank B; Yingling; Hamilton, ,Ohio

Application Ma j1s, 1944 Serial No. 536,220

7 Claims. (Cl; 29-90) The present invention relates to burnishing tools and has for an object theprovision of afdv'ice ofthisf kindthat is simple and compact, and affords a considerable saving in time during use.

. Another object of the invention is to provide a device of this kind with a self contained means folcontaining lubricant and a manually operated means to selectively supply lubricant therefrom to the working end or tip of the tool. 7

Still another object of the invention is to provide a tool of this character having interchangeable working tips that are easily connected to or removed from the remainder of the tool without loss of lubricant from the self contained supply.

Afurther object of the invention is to provide a burnishing tool that is particularly advantageous in use uponjlarge objects suchas the skin of metal airplanes, where the worker has heretofore lost much valuable time while employing the old familiar method of burnishing away the blemishes on the metal in places that are not freely access sible.

These and other objects are attained by the companying drawing, in which: i 4

Fig. 1 isa longitudinal sectional viewshowing a preferred embodiment of the 'invention,part being brokenawayq i Fig; 2 is an elevational View of an interchangemeans described herein and disclosed in the acable burnisher tip for the device of Fig. 1.

Fig-dis a topplan viewof the device of Fig. 2. Fig; 415 an elevational view of another interchangeable burnisher tip for the device of Fig.1. I Fig. 5 is a top plan view of the device of Fig. 4.

Heretofore the hand burnishing of metal products to remove scratches, blemishes and the like has been carried out by placing a drop of oil or otherlubricant on the work or on the properly shapedend of a smoothly ground tool. The points ortips of the tools were formed in a variety of shapesand the operator customarily selects the shape best adapted to the contour of the part upon which he is working at a particulartime. The operator would also have with him an oil can for applying lubricant as required; In the large scale production of products which require burnishing, much time islost by those engaged in the hand; burnishingv operations. The operator frequentlm doesnOt select all of the differently shaped burnishing tools that he may require and'n'iust, in that event return to the tool crib for additional tools. \Furthermore the separate handling of the oil, can becomes a nuisance and a source of lost time; especiallywhen becomes lost, ordr'ops to some inaccessible place. In the construction of metal aircraft, these time losses assume excessive proportions, particularly when the burnishing hands arerequired to work on the various parts of large aircraft, and they frequently lose or drop I the oil can whileworking at considerable elevation above the floor so that they are tempted and, frequently do neglect to use a suitable amount of lubricant in polishing the blemishes from the met-' al skin of the craft.

By means of the present invention all these various time losses are completely eliminated in as I sure the flow of a measured quantity of oil which much as the operator may withdraw from the tool criba single tool having a plurality of interchangeable burnishing tips and having moreover a selfcontainedand selectively releasable supply of oil. Reference is made to the drawing, particularly to Fig. 1 which illustrates a preferred embodiment of the self oiling burnishing tool of theinvention. The tool of the invention comprises a tubular shank 8 which is threaded at the handle end 9 and at the tip end Ill. The bore of shank 8 at the tip end has a ground valve seat II for seating a valve I2 secured on an elongated stem I3. The stem has thereona circular washer I4. A handle I5 may be made of any suitable rigid material, preferably a transparent synthetic plastic. The handle may be roundand' the enlarged portion thereof comprises an oil chamber I6. The reduced end ll of the handle is interiorly threaded for a distanceto receive the threads 9 of the tool shank '8. A lock nut I8 is also carried by the I threaded shank 8 and serves to securely bind the shank in the reduced end of the handle. The reduced end I! of thehandle also has a bore I9 in which there is seated a coil spring 20 which abuts the end of shank 8 and one face of the washerl l on the valve stem. By this arrangement the valve I2 is spring retained in a closed position. When the valve stem is depressed, valve I2 opens and the washer I4 acts as a pump to asis below the washer I4 while the washer, in enterme the reduced bore I9 prevents the uncontrolled flow of oil from the reservoir or oil chamber I6.

At the top of handle I5 there is an interior thread 2| to receive the reduced threaded and shouldered end 22 of a cap 23. Cap 23 has an enlarged recess or counter-bore 24 and a central tapered bore 25. A tapered button member 25 passes through the bore 25 and the top of the button is arranged stud 28 has a bore 30 extending partly therethrough for freely receiving the end of valve stem l3.

The exterior thread 3| at the free end of the tubular shank 8 is adapted to receive a burnish ing tip 32 of any selected style, said tip 32 being desirably of the same diameter as the tubular shank 8-. Tip 32 has a bore '33 which is inter nally threaded for the reception of thread 31, said bore being extended sufficiently to permit the valve l2 to be moved from its seat. Tip 32 has a transverse bore 34 and an axial bore 35 which provides communication between the bores '33 and 34. That portion of the wall of bore 35 nearest the points is slightly ground away as at 36 so as to insure the flow of released oil onto the tip of the tool where it is needed.

In Figs. 2 and 3 there is separately illustrated an interchangeable burnishing tip of the so-cal1ed generally triangular shape, this tip being indicated at 320,the transverse bore an: and the break or ground away portion being indicated at 360.

In Figs. 4 and 5 an interchangeable tip of the so-called half-round shape is indicated at 3200.

In use, 'the tool normally has the valve [2 closed under the influence of spring 20 and the chamber I 6 containing oil is closed by the cap and the oilseal felt 29. The too] would be issued from the tool crib with a varietyof the small tips such as 32,320, 3200, and possibly a number of other shaped tips. A section of a drill rod (not shown) of a diameter to be accommodated in the bore 34 of the tip serves as a Wrench for use in the attachment and detachment of the interchangeable tips. The entire tool witha plurality of differentlyshaped burnishing tips forms a very compact arrangement that can be carried in the tool pocket of the worker who is thus relieved of the necessity of carrying an oil can in climbing about scaffolding and the like. while burnishing the various blemishes which must be sought for and removed as the operator progressively assumes the work. If the contour of the surface to be burnished requires a differently shaped tool, the'operator merely substitutes a selected one without leaving the work, then depresses thebutton 26 slightly with the thumb to release a small amount of 'oil which flows onto the working surface of the newly substituted tip.

In filling the chamber IS with oil, the cap 23, which may have a knurlededge, is unscrewed and the button structure .26 remains frictionally attached through the agency of the felt washer. The piston rod remains in place and under the influence of spring 20 so that valve I2 remains closed during the filling operation. 7

From the foregoing the advantages as well as the care and operation of the tool will be readily understood. It is to be understood furthermore that the device of the invention may be subject to limited variation in structural detail within the spirit of the invention and the scope of the.

the free end of the shank and having an axial bore for communication with the hollow shank when the valve is open, and a transverse bore connecting with the axial bore, and means manually operable from the exterior of the handle and for opening said valve.

2. In a self oiling burnishing tool the combination of a hollow handle and shank structure for containing oil, a valve normally closing the free end of the shank, a cap including a relatively removable finger piece fcr closing the end of the handle, a valve stem connected to the valve and extended through the shank and handle and. into the finger piece in the cap, yieldable means for retaining the valve in a normally closed position and yieldingly resisting manual depression of the finger piece in the cap and a burnishin tip removably secured on the free end of the shank and having passageways for providing communication between the exterior surface of said tip and a hollow interior of the shank. v

3. A self oiling burnishing tool comprising a hollow handle, a hollow shank attached to the handle and having open communication with the interior thereof, avalve stem extending through the handle and shank, said handle having an axial bore of reduced diameter, a spring surrounding the valve stem and disposed in said reduced bore in said handle and abutting" the inserted end of said shank, a fixed 1unger washer on the valve stem and forming an abutment for the spring whereby the washer plunger normally provides open communioation through the handle and shank, means for closing the handle and leak proof means carried by the last mentioned means for manually depressing the valve stem and entering the nation with a hollow shank adapted for the conmember remcvably mounted on trolled passage of oil therethrough, threads on the free end of said shank, and an interchangeable tip member having an axial bore, threads in said bore for removably mounting the tip on the threaded end of said hollow shank, the opposite free end of said tip member having a predetermined shape for burnishing operations, said tip having a transverse bore therein communicating intermediate its ends with the lower end of the axial bore, the wall of the transverse bore in said tip being cut away on the side opposite its point of communicationwith the axial bore whereby oil passing through the axial bore i flowed onto the working surfaces of the tip.

5. An interchangeable tip for a self oiling burnishing tool comprising an elongated member having an axial bore at one end, means on said end for attaching said tip to a hollow shank, the other end of said tip having a predetermined shape for selected burnishing-operations, said tip being provided intermediate its endswitha transverse bore in constant communication with the axial bore, the wall of which transverse bore is cut away at at least one end to form a shallow directional oil channel extending toward the provided with shallow surface ways afiording free flow of oil from the ends of the transverse bore onto the working surface of said shape of predetermined form. v r

'7. In a hand burnishing tool the combination 0! a hollow handle and a shank structure for receiving a supply ofoil, the end of the shank being exterior-1y threaded and interiorly developed into a valve seat, a removable burnishing tip body having a hollow interiorly threaded end for mounting on the threaded end of said shank, said tip having a transverse bore and a restricted axial bore communicating therewith and with said hollow end, the surface of said tip provided with shallow cut-away portions communicating with the ends of the transverse bore in the tip for directionally distributing oil from said transverse bore toward the work end of said removable tip, and

a valve member yieldably retained on the seat in the end of the shank.

WILLIAM E. MACGUIRE. KENNETH J. DODGE. 

